Réponses

2014-02-07T18:09:33+01:00
a.45/14 × 49/60 = 2205/840 = 15 x 187 / 15 x 56 = 187/56
b.5/3 × 4/5 = 20/15 = 5 x 4 / 5 x 3 = 4/3
c.45/26 × 65/72 = 2925/1872 = 117 x 25 / 117 x 16 = 25/16
d.2 × 9/6 = 18/6 = 6 x 3 / 6 x 1 = 3/1 = 3
e.7/6 × 6/7 = 42/42 = 42 x 1 / 42 x 1 = 1/1 = 1
f. 12,4/6 × 8 = 74,4/48 = 74,4 x 10 / 48 x 10 = 744/480 = 24 x 31 / 24 x 20 = 31/20
g. 2,5/3 × 3/0,5 = 7,5/1,5 = 7,5 x 10 / 1,5 x 10 = 75/15 = 15 x 5 / 15 x 1 = 5/1 = 5
h. 5,6 × 9/0,7 = 50,4/0,7 = 50,4 x 10 / 0,7 x 10 = 504/7 = 7 x 72 / 7 x 1 = 72/1 = 72
i.0,55 × 2/11
= 1,1/11 = 1,1 x 10 / 11 x 10 = 11/110 = 11 x 1 / 11 x 10 = 1/10
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